Low MCV with low red cell count and low hemoglobin indicates microcytic anemia. The size of red cells tells you what causes anemia. Equal to (hematocrit)/(red blood cell count). Mean corpuscular volume (MCV): Identifies if red cells are the right size If red blood cell count and hemoglobin are high, usually hematocrit is high, too. If red blood cell count and hemoglobin are low, usually hematocrit is low, too. Equal to (red blood cell count)/(volume of blood measured). Hematocrit (HCT): The portion of a volume of blood that is red blood cells Anemia is a decreased ability to carry oxygen from lungs to tissues. Even if red blood cell count is normal, low hemoglobin will cause symptomatic anemia. If red blood cell count and hematocrit are high, usually hemoglobin is high, too. If red blood cell count and hematocrit are low, usually hemoglobin is low, too. Common causes of high hemoglobin include lung disease, neoplastic conditions including cancers, and dehydration. Common causes of low hemoglobin include vitamin or mineral deficiency, chronic inflammation, autoimmune disease, hemoglobinopathies, thalassemia, GI bleeding, surgery and blood loss. Hemoglobin binds oxygen so that red cells can carry them through the blood into the tissues. Hemoglobin constitutes about 95% of the mass of a red blood cell. 
Hemoglobin (Hb): The amount of hemoglobin in a volume of blood Please refer to previous posts for detailed discussion of causes of low and high RBC.Red blood count: The count of all red blood cells in a volume of blood These tests (called red cell indices) are assessed together to point to specific causes of red blood cell dysfunction.
A number of red blood cell tests are performed together in a complete blood count (CBC).
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